<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class UploadController extends Controller
{
    //
    public function upload() {
        return view('/upload');
    }

    //
    public function gmt_iso8601($time) {
        $dtStr = date("c", $time);
        $mydatetime = new DateTime($dtStr);
        $expiration = $mydatetime->format(DateTime::ISO8601);
        $pos = strpos($expiration, '+');
        $expiration = substr($expiration, 0, $pos);
        return $expiration."Z";
    }

    public function ajax() {
        require_once '/oss/oss_php_sdk_20140625/sdk.class.php';
        $id= 'LTAIm0cnDLJs1aen';
        $key= 'Pc3M4EN1yPSdU8zny3Ln4QppC58P3G';
        $host = 'http://testxiang.oss-cn-shanghai.aliyuncs.com';
        $now = time();
        $expire = 30; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问
        $end = $now + $expire;
        $expiration = gmt_iso8601($end);

        $oss_sdk_service = new alioss($id, $key, $host);
        $dir = 'user-dir/';

        //最大文件大小.用户可以自己设置
        $condition = array(0=>'content-length-range', 1=>0, 2=>1048576000);
        $conditions[] = $condition;

        //表示用户上传的数据,必须是以$dir开始, 不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录
        $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
        $conditions[] = $start;


        //这里默认设置是２０２０年.注意了,可以根据自己的逻辑,设定expire 时间.达到让前端定时到后面取signature的逻辑
        $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
        //echo json_encode($arr);
        //return;
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));

        $response = array();
        $response['accessid'] = $id;
        $response['host'] = $host;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $end;
        //这个参数是设置用户上传指定的前缀
        $response['dir'] = $dir;
        echo json_encode($response);
    }
}
